Google offers a AdWords feature called “location extensions,” which work by allowing you to dynamically return relevant business addresses with your clients’ text ads based on a user’s location and search terms. With location extensions, you can offer more information about your business to customers. Location extensions attract user attention by displaying an address as another line of text on Google.com and with a custom icon on Google Maps. Most important benefit for larger accounts and agencies is the ability to create and edit ads at scale. For each text ad you create, AdWords can automatically generate muliple ad variations by dynamically matching your ad with relevant business addresses you’ve uploaded to LBC. When you edit an ad, your addresses’ll be displayed with new ad text immediately. There’re three steps for getting started with location extensions and they all take place on Settings tab in your account.
More info: AdWords Agency blog